mendelevium

• Product Name:mendelevium
• Synonyms: mendelevium
• CAS:
• MF:Md
• MW:258
• EINECS:
• Mol File:Mol File
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Mendelevium, the ninth transuranium element of the actinide series to be discovered, was first identified by Ghiorso, Harvey, Choppin, Thompson, and Seaborg early in 1955 as a result of the bombardment of the isotope ²⁵³Es with helium ions in the Berkeley 60-inch cyclotron. The isotope produced was ²⁵⁶Md, which has a half-life of 78 min. This first identification was notable in that ²⁵⁶Md was synthesized on a one-atom-at-a-time basis. Nineteen isotopes and isomers are now recognized. ²⁵⁸Md has a half-life of 51.5 days. This isotope has been produced by the bombardment of an isotope of einsteinium with ions of helium. It now appears possible that eventually enough ²⁵⁸Md can be made so that some of its physical properties can be determined. ²⁵⁶Md has been used to elucidate some of the chemical properties of mendelevium in aqueous solution. Experiments seem to show that the element possesses a moderately stable dipositive (II) oxidation state in addition to the tripositive (III) oxidation state, which is characteristic of actinide elements.